I have migrated an toolbar initially developped for ArcGis 9,3. This tool is used by non-programmer or cartographers.
One procedure is called to generate centroids of attributes table and after to launch an calculation.
The source code used in 9,3 was :
'instantiating new calculator and cursor
pCalculator = New Calculator
pCursor = CType(pFeatureClass.Update(Nothing, True), ICursor)
.Cursor = pCursor
.PreExpression = "Dim pGeomShp as IGeometry" & vbNewLine & "Set pGeomShp = [shape]" & vbNewLine & "Dim pArea as IArea" & vbNewLine & "Set pArea = pGeomShp" & vbNewLine
.Expression = "pArea.Centroid.Y"
.Field = "centroidY"
'try & catch *************************************************
Catch ex As System.Exception
MessageBox.Show("Error: " + ex.Message)
This was working until moving to ArcGis 10 (an upper). A crash was observed while launching pCalculator.Calculate().
I’ve migrated this code that way (like proposed here http://gis.stackexchange.com/questions/52983/syntax-for-arcgis-icalculator-object/198681#198681 ) :
Dim nCentroidXFieldIndex As Integer = pFeatureClass.FindField("centroidX")
Dim nCentroidYFieldIndex As Integer = pFeatureClass.FindField("centroidY")
Dim nBldg_sizeFieldIndex As Integer = pFeatureClass.FindField("Bldg_size")
If TypeOf pFeatureClass Is IFeatureClass Then
If TypeOf pFeatureCursor Is IFeatureCursor Then
Dim pArea As IArea
Dim pFeature As IFeature = pFeatureCursor.NextFeature()
Dim myProgressCalc As New FileProgressForm
myProgressCalc.Text = "Veuillez patienter svp"
myProgressCalc.lblProgress.Text = "Calcul des données géographiques"
pArea = CType(pFeature.Shape, IArea)
While pFeature IsNot Nothing
pFeature.Value(nCentroidXFieldIndex) = pArea.Centroid.X
pFeature.Value(nCentroidYFieldIndex) = pArea.Centroid.Y
pFeature.Value(nBldg_sizeFieldIndex) = pArea.Area
pFeature = pFeatureCursor.NextFeature
It’s working but it’s working extremely slowly ! The first code (A) was executed in less than 3 minutes. The new one (B) in 25 minutes !
In fact, I just want to programmaticaly call a the new calculate geometry tool (when displaying attributes table - http://desktop.arcgis.com/fr/arcmap/10.3/manage-data/tables/calculating-area-length-and-other-geomet... )
Screen capture 1
Too bad, can't upload PNG and JPEG files...
or Arc tool => Data Management Tools => Entities => Add geometric attributes (http://pro.arcgis.com/fr/pro-app/tool-reference/data-management/add-geometry-attributes.htm )
Screen capture 2
or any other methods !
Both tools are working great in ArcGis Desktop but I can’t find my way to make them work in VB.NET.
Please, any suggestions ? (It’s just driving me crazy).
Thanks by advance for your answer, and sorry for screen capture in french and for poor english speaking
One issue with your ICalculate PreExpression script is with ArcGIS 10, VBScript will now crash when try to declare a variable as a type.
Dim pGeomShp as IGeometry
should be replaced with
I just made the change you proposed without any success.
The following error is still showing :
"Error -2147467259 HRESULT E_FAIL has been returned from a call to a COM component"
Yes, I also made the change for the "Dim pArea" line. With no success.
I tried to execute this code manually in ArcGis desktop. But unfortunately, it did'nt work. I'm realizing that I should write the good script here before trying to program it.
I made many tries in VB. Tthe only thing that were working correctly (manually, in desktop ) was in Python with that code :
But I just can't make it work in the program.
Unfortunately, there's a bug with the ICalculator (#NIM061356) that doesn't allow it to use Python syntax. This has been around since 2010 and while it's classified as High Severity, they still haven't fixed it.